Knee joint



The article in which the design is embodied is intended for use in aprosthesis.

FIG. 1 is a front view;

FIG. 2 is a rear view;

FIG. 3 is a left side view;

FIG. 4 is a right side view;

FIG. 5 is a bottom view; and,

FIG. 6 is a top view.

The ornamental design for a knee joint, as shown and described.